3
votes
2answers
84 views

SMTP: Which IP should I monitor?

I use a relay server to deliver external mails. I use relay server's IP in SPF record. But I'm not sure about blacklist monitoring/checking. Should I check main server's IP or relay's IP?
1
vote
3answers
2k views

How to go about deploying batches of 5,000 emails?

I have been warned that sending too many emails too quickly can trigger an internet email blacklist/spam filter. I have a list of approximately 5,000 customers that I want to send a newsletter to. I ...
4
votes
3answers
752 views

Customer's IP Listed on RBL - What steps do you use to prevent black listing?

Customer called saying their e-mail was bouncing from particular vendors. Investigated it and identified they were listed on more than one RBL/CBL. Restricted firewall to only allow traffic on port ...